Android Question Password and variable security

[slowtime]

I am going to write a passwords keeper using Encryption library.
Can you help me ?

a) on "ExitApplication" are all variables values deleted ? Or must I set their value to "null" before close the app ?

b) Are variable values cached in device ? In positive case is possible delete the cache ?

Thank you in advance.
p.s. sorry for my english

 

[Erel]

a) Yes. Though you do not need to call ExitApplication. The memory used by your application process is not accessible from any other process.

b) The variables are not cached.

 

[slowtime]

Thank you very much.
Ciao